a volume unit, equals to (2401/1331) litre (approximately 1804 millilitre).

五輪: Olympic Rings; Olympic Games

久しい: long, a long time since

(historical) a kind of dagger used by the samurai class, carried in the 懐 (futokoro, “chest area of a kimono above the 帯 (obi, “sash”) and inside the collar”) for self-defense